US7809787B2 - Service providing apparatus, service providing method, and control program - Google Patents

Service providing apparatus, service providing method, and control program Download PDF

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US7809787B2
US7809787B2 US11/569,521 US56952105A US7809787B2 US 7809787 B2 US7809787 B2 US 7809787B2 US 56952105 A US56952105 A US 56952105A US 7809787 B2 US7809787 B2 US 7809787B2
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service
information
search condition
request
response
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US20070226352A1 (en
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Masahiro Nishio
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Canon Inc
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Canon Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services

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  • the invention relates to a service providing apparatus which provides services according to a service request from a client device on a network, a service providing system having such a service providing apparatus, a service providing method, and its program.
  • a service providing apparatus and a service providing system which provide services according to a service request from a client device on a network have been known.
  • a variety of kinds of apparatuses other than conventional personal computers have been developed as network communicating-type apparatuses.
  • network communicating-type apparatuses For example, with respect not only to user-interactive devices such as PDA (Personal Digital Assistants), cellular phones, and the like but also image processing apparatuses such as scanners, printers, copying apparatuses, and digital cameras, household appliances such as televisions, air conditioners, and refrigerators, and the like, measures for making those apparatuses capable of communicating via a network are rapidly being taken.
  • SSDP Simple Service Discovery Protocol
  • UPN registered trademark
  • the client device executes a process for sending a data packet describing the searching condition (hereinafter, referred to as a search packet) onto the network in order to search for the usable device existing on the network.
  • a search packet a data packet describing the searching condition
  • each network device receives the search packet.
  • the network device which satisfies the searching condition included in the search packet transmits response data which responds to the search packet to the client device which issued the search packet.
  • the method of transmitting the search packet to all of the network devices connected to the network as mentioned above has a problem in that, for example, if the search packet contains a large amount of data including a large amount of searching conditions, the communication load on the network increases and the efficiency of the network process deteriorates.
  • the searching means as mentioned above is used in, for example, a household LAN (Local Area Network) or a LAN in a small office where there is no possibility of intervention of a malicious third party.
  • a household LAN Local Area Network
  • a LAN Local Area Network
  • the searching means may be used illegally by a malicious third party.
  • such illegal use can itself affect the network system which provides the services.
  • the malicious client frequently issues search packets to which a large amount of searching conditions have been added, naturally, the corresponding increase in volume of traffic on the network results in the service providing apparatus which received the search packet continuing to analyze the contents of the searching conditions, and thus there is a possibility that the device does not function.
  • the invention is made in consideration of addressing at least one of the foregoing problems, and it is an object of the invention to provide a service providing system, a service providing method, and its program in which even if a large number of searching conditions are set in order to search for a desired device from among network devices connected to a network, a searching process of the network device can be efficiently executed.
  • Another object of the invention is to provide a service providing system, a service providing method, and its program in which in a process for searching for a desired device from network devices connected to a network, stability (particularly, performance which can survive an attack from outside) of the network system can be improved.
  • the service providing method, and its program of the invention even if a large number of searching conditions are set, in order to search for the desired device from the network devices connected to the network, the searching process of the network device can be efficiently executed.
  • a service providing apparatus comprising: obtaining means for obtaining specific information to specify a service of which the apparatus is notified by a client device; and response means for outputting response information on the basis of whether or not the service specified by the specific information obtained by the obtaining means can be provided.
  • FIG. 1 is a block diagram showing a schematic construction of a print service providing system according to an embodiment of the invention.
  • FIG. 2 is a flowchart showing a flow for processes of a client device 100 in the print service providing system shown in FIG. 1 .
  • FIG. 3 is a diagram showing an example of an HTTP request for searching for a UPnP (registered trademark) corresponding printer existing on a network 20 in the embodiment of FIG. 1 .
  • UPnP registered trademark
  • FIG. 4 is a diagram showing an example of description of searching conditional expressions in the embodiment of FIG. 1 .
  • FIG. 5 is a flowchart showing the operation of a printer 200 shown in FIG. 1 .
  • FIG. 6 is a diagram showing an example of a format of information which is used for the printer 200 to notify of its own network address.
  • the service providing system in the embodiment is a print service providing system and a protocol converting system which is used in this print service providing system will now be described.
  • FIG. 1 is a block diagram showing a schematic construction of the print service providing system according to the embodiment of the invention.
  • a client 100 , a printer 200 , and a proxy processing server 300 are connected through a network 20 .
  • a general operating system (hereinafter, abbreviated to “OS”) such as “Windows” (registered trademark) developed by Microsoft Corporation, “MacOS” developed by Apple Computer, Inc., or the like and general applications which can be executed on the OS have been installed in the client 100 .
  • the client 100 is constructed of an OS 1 , a UPnP (registered trademark) protocol processing unit 2 , a printer driver 3 , and an application processing unit 4 .
  • the UPnP (registered trademark) protocol processing unit 2 can execute discovery, control, obtaining of the status, and the like of devices on the network 20 by a protocol using XML (eXtensible Markup Language)/SOAP (Simple Object Access Protocol).
  • XML eXtensible Markup Language
  • SOAP Simple Object Access Protocol
  • a document formed by the application processing unit 4 is converted by the printer driver 3 into data which can be print-processed by a printer.
  • a print job is issued to the printer on the network 20 corresponding to the UPnP (registered trademark) protocol searched and found by the UPnP (registered trademark) protocol processing unit 2 .
  • the printer 200 is a network correspondence device (network-corresponding-type printer), i.e., it can be used through the network 20 .
  • the printer 200 has a protocol stacking unit 5 as a communicating function for communication through the network 20 .
  • the printer 200 has an HTTP processing unit 6 , an SOAP processing unit 7 , a UPnP (registered trademark) protocol processing unit 8 , and a printer controller 9 .
  • the protocol stacking unit 5 has a function of stacking a protocol such as TCP/UDP/IP or the like.
  • the HTTP processing unit 6 is constructed as an upper unit of the protocol stacking unit 5 and executes analysis of an HTTP request and a responding process.
  • the SOAP processing unit 7 is constructed in an upper layer of the HTTP processing unit 6 and executes analysis of a UPnP (registered trademark) request described by XML-SOAP and a responding process.
  • the UPnP (registered trademark) protocol processing unit 8 executes a searching process, a description process, a control process, and an event process specified by the UPnP (registered trademark) in an upper layer of the SOAP processing unit 7 .
  • the UPnP (registered trademark) protocol processing unit 8 has a function of communicating with the printer controller 9 , converts each process specified by UPnP (registered trademark) into a communicating procedure peculiar to the printer controller 9 , executes the print job, and executes processes for obtaining of the printer status and the like.
  • the printer controller 9 executes a printing process and its control.
  • the proxy processing server 300 has a protocol stacking unit 10 , an HTTP processing unit 11 , and a memory processing unit 12 .
  • the protocol stacking unit 10 executes a process for stacking the TCP/UDP/IP protocol in order to realize the communicating function through the network 20 .
  • the HTTP processing unit 11 is constructed in an upper layer of the protocol stacking unit 10 and executes analysis of the HTTP request and the responding process.
  • the proxy processing server 300 has a recording apparatus (not shown) for recording a searching expression for a condition search and a URL of the service providing apparatus which has made a response to the condition search.
  • the memory processing unit 12 located in the upper layer thereof executes writing/reading processes of the searching expression and writing/reading processes of the URL of the response device to a recording apparatus.
  • a plurality of printers in which functions which are supported, processing abilities, and the like are different although they have substantially the same construction as that of the network corresponding printer like a printer 200 are connected onto the network 20 .
  • a plurality of client devices having a construction similar to that of the client device 100 or a plurality of proxy processing servers having a construction similar to that of the proxy processing server 300 are connected to the network 20 .
  • FIG. 2 is a flowchart showing a flow for processes of the client device 100 in the print service providing system shown in FIG. 1 .
  • the client device 100 searches for the UPnP (registered trademark) corresponding printer existing on the network 20 (step S 1 ).
  • FIG. 3 is a diagram showing an example of an HTTP request for searching for a UPnP (registered trademark) corresponding printer existing on the network 20 in the embodiment of FIG. 1 .
  • the HTTP request having the format shown in FIG. 3 is issued to, for example, a multicast address 239.255.255.250 and a port number 1900.
  • “Print” is designated in an ST (Service Type) header, thereby notifying that the HTTP request is a request to search for print service.
  • the SOAP Simple Object Access Protocol
  • the SOAP is used as an entity body of the HTTP request and the details of the searching condition are communicated to the recipients upon issuing of the request, so that another condition can be further added to the service designated by the ST header.
  • SOAP function is defined in accordance with the format specified by the SOAP:
  • the above SOAP function realizes a function of notifying of the various conditions of the condition search.
  • “filtering” shown in row 303 is a flag indicative of the presence or absence of execution of the condition search and is set to either a value of “TRUE” or a value of “FALSE”. In the case of TRUE, the condition search is executed. In the case of FALSE, the condition search is not executed.
  • “descriptionURL” shown in row 304 when the filtering flag is TRUE, a description destination of the conditional expression of the condition search is shown in the format of the URL.
  • the service providing apparatus corresponding to a service name described in the ST header mentioned above accesses the URL described as contents of “descriptionURL”.
  • a third network corresponding information processing apparatus proxy processing server 300 in the present embodiment
  • the network-corresponding device which can provide services and satisfies the conditions designated by the condition search notifies the URL of its own network address in the format of the URL.
  • the third network-corresponding information processing apparatus can be designated as a response destination of the service providing apparatus which has made a response, and so accesses to the client device from an unspecified large number of service providing apparatuses can be avoided.
  • the URL of the third network-corresponding information processing apparatus is described as contents of the descriptionURL element of the ComplexQueryRequest function.
  • the client device 100 forms a conditional expression described in XML, records the conditional expression into the recording apparatus through the OS, and describes the recording destination as a URL into “descriptionURL” of the ComplexQueryRequest function.
  • FIG. 4 is a diagram showing an example of description of the searching conditional expressions. As shown in FIG. 4 , the conditional expressions in this embodiment are described in XML.
  • the AND of the items described as contents of a “FilteringDescription” tag shown in row 401 in FIG. 4 becomes the searching condition. That is, in the case of the example shown in FIG. 4 , a condition in which the color printing is possible is set in row 402 , a condition in which the resolution is equal to or more than 600 dpi is set in row 403 , and a condition in which the printer has a stapler (stapling function) as a finisher function is set in row 404 .
  • the client device 100 transmits the formed conditional expressions to the proxy processing server 300 by using an HTTP-POST request (step S 5 ).
  • a transmission destination URL is described as the contents of the descriptionURL element of the ComplexQueryRequest function.
  • the proxy processing server 300 records the received conditional expressions into the recording apparatus through the memory processing unit 12 .
  • the client device 100 describes a recording destination URL as contents of the descriptionURL element of the ComplexQueryRequest function.
  • the client device 100 sends an SSDP packet onto the network 20 (step S 6 ).
  • the client device 100 executes a process to select either a mode in which the response URL is set to the network address of the client device 100 itself or a mode in which it is set to the proxy processing server 300 .
  • the printer 200 receives the SSDP packet through the network 20 .
  • the explanation of FIG. 2 is temporarily interrupted and the operation of the printer 200 which received the SSDP packet will now be described with reference to FIG. 5 .
  • FIG. 5 is a flowchart showing the operation of the printer 200 shown in FIG. 1 .
  • the printer 200 analyzes the ST (Service Type) header of the HTTP request (step S 22 ). If it is analyzed in the ST header that it indicates an ST designation other than “Print” (NO in step S 22 ), the printer 200 interrupts the processing routine, does not issue a response to the HTTP request, and returns to step S 21 . If it is analyzed in the ST header that it indicates the ST designation of “Print” (YES in step S 22 ), the printer 200 discriminates about the possible presence of any illegality in the packet contents (step S 23 ).
  • ST Service Type
  • step S 23 If it is determined here that the packet contents are illegal (YES in step S 23 ), the printer 200 interrupts the processing routine in a manner similar to the case of NO in step S 22 and returns to step S 21 . If it is determined here that the packet contents are not illegal (NO in step S 23 ), the printer 200 executes the analysis of the entity body of the HTTP request (step S 24 ).
  • the printer 200 analyzes whether or not the filtering flag is FALSE (step S 25 ). If it is analyzed here that the filtering flag is FALSE (NO in step S 25 ), the printer 200 notifies the response destination URL described as “responseURL” contents of its own network address in the format of the URL (step S 30 ).
  • FIG. 6 is a diagram showing the example of the format of the information which is used for the printer 200 to notify of its own network address.
  • the SOAP is used as an entity body of the HTTP POST and the following SOAP function is defined in row 601 :
  • the SOAP function realizes the function of communicating the response information by the network corresponding printer such as a printer 200 connected to the network 20 corresponding to the conditions of the condition search.
  • profileURL the recording destination of a document describing the details of attribute information of the printer 200 (network corresponding printer) is shown by the URL.
  • controlURL the transmission destination of job data to the printer 200 (network corresponding printer) is shown by the URL.
  • filtering which is discriminated by the printer 200 in step S 25 is the flag indicative of the presence or absence of the execution of the condition search and is set to either the value of “TRUE” or the value of “FALSE”. In the case of TRUE, the condition search is executed. In the case of FALSE, the condition search is not executed. If the filtering flag is TRUE (YES in step S 25 ), the printer 200 discriminates whether or not the device side can execute the analyzing process of the searching expression (step S 26 ). If it is determined here that the device side cannot execute the analyzing process of the searching expression (NO in step S 26 ), the printer 200 does not issue a response to the SSDP request and returns to step S 21 .
  • the printer 200 issues HTTP GET to the URL described in “descriptionURL” and obtains the conditional expression of the condition search.
  • the client device 100 or the proxy processing server 300 which received the HTTP GET request from the printer 200 returns the conditional expression recorded in the designated URL to the printer 200 .
  • the printer 200 receives the conditional expression.
  • step S 27 the printer 200 discriminates whether or not it has received the conditional expression from the client device 100 . If the printer 200 fails in obtainment of the conditional expression (NO in step S 27 ), the printer 200 interrupts the processing routine, does not issue a response to the SSDP request, and returns to step S 21 .
  • the printer 200 analyzes the contents of the conditional expression (step S 28 ). If it is determined by the analysis that the condition described in the conditional expression coincides with the contents of the service provided by the printer 200 itself (YES in step S 29 ), the printer 200 notifies the response destination described in “responseURL” of its network address in the format of the URL (step S 30 ). At this time, the printer 200 issues “ComplexQueryResponse” and notifies the system of the response information.
  • the printer 200 does not issue a response to the SSDP request and returns to step S 21 .
  • the printer 200 can return this fact according to a response request (issuance of the SSDP) including the conditional expression received from the client device 100 .
  • step S 6 the client device 100 discriminates whether or not the transmission destination of the response URL has been designated to the proxy processing server 300 (step S 7 ). If the transmission destination of the response URL has been designated to the proxy processing server 300 here (YES in step S 7 ), the client device 100 discriminates whether or not a predetermined time has elapsed (step S 8 ). In the present embodiment, it is assumed that the predetermined time has been set to 30 seconds.
  • step S 8 the client device 100 accesses the set response URL and discriminates about the presence or absence of the response information (step S 9 ). If it is decided here that there is no response (NO in step S 9 ), since this means that no device which can provide the condition-designated service exists, the client device 100 finishes the processing routine (step S 13 ).
  • the client device 100 determines that a device which can provide the condition-designated service exists, and executes the following processes of steps S 10 to S 12 . Particularly, if there are a plurality of responses in step S 9 , in order to decide which service is to be used, the client device 100 issues HTTP GET to “profileURL” as one of the arguments of “ComplexQueryResponse” as necessary and obtains profile information of the devices which have made a response (including the printer 200 ) (step S 10 ). Subsequently, the client device 100 selects the optimum network-corresponding printer on the basis of the obtained profile information (step S 11 ).
  • the client device 100 sends a print job to “controlURL” as one of the arguments of “ComplexQueryResponse” corresponding to the response from the printer 200 and executes printing of the formed document (step S 12 ).
  • the client device 100 discriminates whether or not there is a response to the response URL. If it is determined that a response exists (YES in step S 14 ), the client device 100 determines that a device which can provide the condition-designated service exists, and executes the processes of steps S 10 to S 12 mentioned above.
  • step S 15 the client device 100 discriminates whether or not a predetermined time has elapsed.
  • the predetermined time is set to 30 seconds. If it is decided that the predetermined time has not elapsed (NO in step S 15 ), the processing routine is returned to step S 14 . If it is decided that the predetermined time has elapsed (YES in step S 15 ), the client device 100 decides that no device which can provide the condition-designated service exists on the network 20 . Step S 13 follows and the processing routine is finished.
  • the client device 100 in the present embodiment broadcasts a response request including the conditional expression described in XML to the network 20 , so that it can search for a network-corresponding printer which satisfies the conditional expression and transmit the print job to the searched printer.
  • the invention is realized by using the SSDP specified by UPnP v1 as a protocol of the service search (search for the network device) and adding the searching condition to the protocol in the foregoing embodiment, the invention is not limited to this arrangement.
  • a service searching protocol various protocols can be applied so long as the protocol can add the searching condition.
  • conditional expression for the condition search is described in the format of the XML in the foregoing embodiment, the describing format is not limited to use of the Markup language such as XML but a CSV (Comma Separated Value), a simple text, or a binary description can be also used.
  • CSV Common Separated Value
  • conditional expression for the condition search is described in the format of the XML in the foregoing embodiment, it is also possible to use “XPath” as a describing format and specify the service.
  • the registration and obtaining of the conditional expression for the condition search by HTTP POST/GET and the recording and obtaining of the response information are executed in the foregoing embodiment, they can be also realized by using another protocol such as FTP or the like.
  • the client device 100 searches for the service providing apparatus (printer 200 ) which provides the service requested by the job. Therefore, the searching conditional expression for the condition search is recorded into the recording apparatus which is managed by the client device 100 itself or into the recording apparatus which is managed by a third information processing apparatus (proxy processing server 300 ). Further, also with respect to the response information of the service providing apparatus which satisfies the condition search, the service providing system has a function of recording such information into the recording apparatus which is managed by the client device 100 itself or into the recording apparatus which is managed by the third information processing apparatus (proxy processing server 300 ).
  • the client device adds the searching conditional expression to the search packet which is transmitted to the network
  • the searching conditional expression is not added to the search packet (instead, a recording location of the searching conditional expression is communicated to the recipients)
  • the communication load of the network can be remarkably reduced.
  • the service providing apparatus can execute it by the judgment of the service providing apparatus on the basis of the received search packet, it is possible to prevent a large number of search packets from being received from malicious client devices. The security performance and the stability of the system can be improved.
  • the recording of the searching conditional expression can be designated as a recording destination of the recording apparatus of the third information processing apparatus (proxy processing server 300 ), and unnecessary accesses from malicious devices can be avoided.
  • the recording apparatus of the third information processing apparatus can be designated as a recording destination and again unnecessary accesses from malicious devices can be avoided.
  • the client device 100 can avoid the transmission of search packets having a large data amount to low-end service providing apparatuses which cannot cope with such a condition search.
  • the service searching process according to the processing ability of the service providing apparatus can be realized.
  • a program to realize the processing functions is read out from the memory and a CPU (central processing unit) executes it, thereby realizing those functions.
  • a CPU central processing unit
  • the memory can be constructed by any one of a magnetooptic disk device, a non-volatile memory such as a flash memory, a read only recording medium such as a CD-ROM, a volatile memory other than a RAM, and a computer-readable/writable recording medium comprising a combination of them.
  • the processes can be also executed by a method whereby programs to realize the functions in the client device 100 and the printer 200 are recorded in the computer-readable recording medium, and the programs recorded in the recording medium are read out and executed by a computer system.
  • the “computer system” used here includes the OS and hardware such as peripheral devices and the like.
  • the invention also incorporates the case where a program read out from a storing medium is written into a memory provided for a function expanding board inserted in a computer or a function expanding unit connected to the computer, after that, a CPU or the like provided for the function expanding board or the function expanding unit executes a part or all of actual processes on the basis of instructions of the program, and the functions of the embodiment mentioned above are realized by those processes.
  • the “computer-readable recording medium” denotes a portable medium such as flexible disk, magnetooptic disk, ROM, CD-ROM, or the like or a storing device such as a hard disk or the like built in the computer system. Further, it is assumed that the “computer-readable recording medium” incorporates a medium which holds the program for a predetermined time, such as a volatile memory (RAM) in the computer system serving as a server or a client in the case where the program has been transmitted through a network such as Internet or the like or through a communicating circuit such as a telephone line or the like.
  • RAM volatile memory
  • the program can be transmitted from the computer system in which the program has been stored in a storing device or the like to another computer system through a transmitting medium or by a transmission wave in the transmitting medium.
  • the “transmitting medium” to transmit the program denotes a medium having a function of transmitting information like a network (communicating network) such as Internet or the like or a communicating circuit (communicating line) such as a telephone line or the like.
  • the program can be a program for realizing a part of the foregoing functions. Further, the program can be realized by combining the foregoing functions with the program which has already been recorded in the computer system, that is, it can be what is called a differential file (differential program).
  • a program product such as a computer-readable recording medium or the like in which the program has been recorded can be also applied as an embodiment of the invention.
  • the program, recording medium, transmitting medium, and program product mentioned above are also incorporated in the purview of the invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer And Data Communications (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
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JP2004174521A JP4500592B2 (ja) 2004-06-11 2004-06-11 サービス提供システム及びサービス提供方法
JP2004-174521 2004-06-11
PCT/JP2005/011101 WO2005121952A1 (en) 2004-06-11 2005-06-10 Service providing apparatus, service providing method, and control program

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US20070226352A1 (en) 2007-09-27
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JP4500592B2 (ja) 2010-07-14
ATE520243T1 (de) 2011-08-15
CN1965294A (zh) 2007-05-16
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EP1763742A1 (en) 2007-03-21
CN100468328C (zh) 2009-03-11

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